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[]
[1981,1982,1983,1984,1985,1986,1987,1988,1989,1990]
{"1981":[1,2,3,4],"1982":[1,2,3,4],"1983":[1,2,3,4],"1984":[1,2,3,4],"1985":[1,2,3,4],"1986":[1,2,3,4],"1987":[1,2,3,4],"1988":[1,2,3,4],"1989":[1,2,3,4],"1990":[1,2,3,4]}
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